Project follow-up: example of HL-LHC - Joana Repolho Correia // Microscopy investigation and high field breakdown characterization on different materials after low energy H- beam irradiation - Catarina Da Palma Serafim //

Tuesday 12 Mar 2024, 10:30 → 12:00 Europe/Zurich

30/7-018 - Kjell Johnsen Auditorium (CERN)

Joana Sofia Repolho Correia (CERN), Catarina Serafim (University of Helsinki (FI))

10:30 → 11:05 Project follow-up: example of HL-LHC

The seminar presents the strategies adopted by the WP12 - Vacuum team for the HL-LHC project. It covers several essential aspects, including Earned Value Management (EVM), quality control, scheduling, regular analysis, reporting, and risk management, which are necessary to achieve holistic project control. EVM ensures that resources are efficiently managed and timelines and budgets are adhered to, while quality control measures guarantee that deliverables meet the established standards. Scheduling methodologies address the critical aspect of timely project execution, and regular analysis and reporting provide valuable insights for informed decision-making. The seminar also highlights the importance of proactive risk management, showcasing how uncertainties are identified, assessed, and mitigated within the context of HL-LHC. The presentation combines theoretical concepts and practical examples, offering an informative and engaging overview of the project follow-up strategies used in the HL-LHC initiative.

Speaker: Joana Sofia Repolho Correia (CERN)

Project follow-up_the example of HL-LHC.pdf

Project follow-up_the example of HL-LHC.pptx

11:10 → 11:30 Microscopy investigation and high field breakdown characterization on different materials after low energy H- beam irradiation.

During operation the LINAC4 RFQ (Radio-Frequency-Quadrupole) is exposed to high electric fields which can lead to vacuum breakdown. It is also subject to beam loss that can cause surface modification, which can result in reduced electric field handling and an increased breakdown rate. An experimental study has been made to identify materials with high electric field capability and robustness to low-energy irradiation. Seven materials have been tested using high pulsing voltage after and before being exposed to H- low voltage irradiation. Surface analysis was preformed after each test using advanced microscopic techniques such as Scanning Electron Microscope, Electron Back Scattered Diffraction, Energy-dispersive X-ray Spectroscopy and conventional optical microscopy. Carbon contamination in some of these materials is also explored with the aim of understanding the existence of a correlation between the presence of Carbon on the materials surface and the breakdown testing.

Speaker: Catarina Serafim (University of Helsinki (FI))

CERN_TE_VSC_seminar_catarina _SERAFIM.pdf

CERN_TE_VSC_seminar_catarina _SERAFIM.pptx